请老师，我的代码有需要优化的吗，谢谢

来源：4-3 编程练习

qq_慕移动3101913

2019-10-18 14:42:16

<!DOCTYPE html> 
<html> 
<head> 
    <meta charset="UTF-8" /> 
    <title>三种定义方式</title> 
</head> 
<body> 
<script type="text/javascript"> 
// 补充代码
var add=new Function('num1','num2','num3','return num1 + num2;');
var sub=new Function('num1','num2','num3','return num1 - num2;');
var mcl=new Function('num1','num2','num3','return num1 * num2;');
var division=new Function('num1','num2','num3','return num1 / num2;');
          //减法(加法(除法,乘法))
          //21*32=672,24/3=8,672+8=680,680-5=675
console.log(sub(add(mcl(21,32),division(24,3)),5));
</script> 
</body> 
</html>

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